Trimodal molecular weight polyether polyol prepolymers

摘要

A trimodal molecular weight toluene diisocyanate endcapped polyether polyol prepolymer is disclosed having free toluene diisocyanate below 0.5 weight percent where the three molecular weight polyols used are 300-800, 800 to 1500 and 1500-10000. Processes to make and use these prepolymers as polyurethane castable elastomers having exceptionally long flex fatigue lives using environmentally friendly materials essentially free of TDI are also disclosed.